| 摘要 |
PURPOSE:To improve the shape of bead in a weld zone by specifying the quantity of plasma working gas supply and quantity of powder supply gas in performing powder build up welding using a plasma torch. CONSTITUTION:In powder build up welding using a plasma torch 1, the quantity of supply of plasma working gas is controlled to (0.03-0.13)X1/4piD<2> (l/min. mm.<2>) when diameter of opening of a plasma restricting nozzle 9 provided on the lower end of the torch inner diameter 3 is Dmm.. The quantity of powder feed gas that supplies powder 14 for build up welding through a powder supply passage 13 is controlled to less than 0.4l/min for quantity of powder supply/g/min. It is desirable to make welding speed above 3.8mm./sec and to make build up welding without weaving of the plasma torch 1. |
